CPU undervolting and power limits: Ryzen Curve Optimizer and Intel settings

Modern processors spend a lot of power for the last few percent of speed. Lowering the voltage (undervolting) or the power limit gives almost the same performance with less heat, less fan noise and a boost that holds longer. This guide is about the processor; for the graphics card see our GPU overclocking and undervolting guide.

1. Before you start

• Update the BIOS to the current version (BIOS guide), and for Intel 13th and 14th generation make sure it contains the latest microcode stability fix.
• Check your current temperatures first (temperature guide) so that you can see the result.
• Change one setting at a time. Settings can be reset in the BIOS (Load Optimized Defaults), so nothing is permanent. Manufacturers may treat manual tuning differently under warranty.

2. The simplest way: a power limit

• AMD: in the BIOS or Ryzen Master choose Eco Mode (for example 105 W → 65 W). Temperatures drop a lot and gaming speed stays almost the same.
• Intel: set PL1 (long-term) and PL2 (short peaks) to values your cooler can handle. Use Intel’s default profile as a base instead of the board’s “unlimited” setting.
• Games rarely use the full limit, so the loss shows up mainly in long all-core jobs such as rendering.

3. AMD Ryzen: Curve Optimizer

1. In the BIOS find Advanced → AMD Overclocking → Precision Boost Overdrive and set it to Advanced (or Manual).
2. Open Curve Optimizer → All Cores → Negative and enter 10. This lowers the voltage for the same clock.
3. Boot into Windows and test (section 5). If stable, go to 15, then 20; many chips work at −15…−30.
4. If a test fails or the PC restarts, go back by 5 steps. Advanced users can tune each core separately.
5. Lowering Platform Thermal Throttle Limit (for example to 85 °C) is another way to keep a hot CPU cooler; it is also available on X3D models, where overclocking is limited but Curve Optimizer works.

4. Intel Core: voltage offset and limits

• Boards with an unlocked (K) CPU have an Adaptive or Offset voltage setting: try a small negative offset like −0.030 V and test; never go in big jumps.
• Some BIOS versions lock voltage offsets for security, then only power limits are available. This is normal.
• Do not lower voltage on 13th and 14th generation chips that are already unstable (crashes, blue screens): first update the BIOS, because unstable chips need more voltage, not less.

5. How to test stability

• Run Cinebench for 15–30 minutes and the OCCT CPU test (see the stress tests article).
• Test light loads too: on Ryzen, too aggressive Curve Optimizer often fails at idle or in a browser, not under full load. Use the PC for a few days.
• Watch HWiNFO for WHEA errors: they mean the setting is unstable even if Windows still runs.
• Play your usual games for an hour; check that FPS did not drop and the temperature did.

6. Symptoms of a too-aggressive undervolt

• Restarts, freezes or a sudden shutdown, especially at idle.
• Blue screens (blue screen guide), especially WHEA_UNCORRECTABLE_ERROR.
• Programs crashing without a reason.
• The fix is the same each time: return to the last stable value and keep a margin of 5 steps.

If you would rather have a PC that is tuned and tested before delivery, build it in our PC configurator.